Subtle structure tailoring of metal-free triazine luminogens for highly efficient ultralong organic phosphorescence |
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Authors: | Xuan Wang Nan Gan Mingxing Gu Kun Ling Chaoqun Ma Huili Ma Wei Yao Yujian Zhang Huifang Shi Zhongfu An Wei Huang |
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Institution: | Key Laboratory of Flexible Electronics(KLOFE) & Institute of Advanced Materials(IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials(SICAM), Nanjing Tech University(Nanjing Tech), Nanjing 211816, China; Department of Materials Chemistry, Huzhou University, Huzhou 313000, China; Shanxi Institute of Flexible Electronics(SIFE), Northwestern Polytechnical University(NPU), Xi'an 710072, China |
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Abstract: | Ultralong organic phosphorescent materials have invoked considerable attention for their great potential in sensing, data encryption, information anti-counterfeiting and so forth. However, effective ways to achieve highly efficient ultralong organic phosphorescence (UOP) in metal-free organic materials remain a great challenge. Herein, we designed three isomers based on asymmetric triazines with various bromine substituted positions. Impressively, phosphorescence efficiency of p-BrAT in solid state can reach up to 9.7% with a long lifetime of 386 ms, which was one of the highest efficient UOP materials reported so far. Theoretical calculations further demonstrated that para-substitution exhibited the most effective radiative transition for triplet excitons. These results will provide an effective approach to achieving highly efficient UOP materials. |
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Keywords: | Ultralong organic phosphorescence (UOP) Isomerism Crystal engineering H-aggregation Intermolecular interactions |
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